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The biology of this invasive species was studied by Kurtak (1973) in the state of New York. A total of 37 plant species (11 plant families) visited for pollen, nectar or both was recorded in that work. Females collected trichomes from the following plants: Echinops exaltatus (Asteraceae), Lychnis coronaria (Caryophyllaceae), Pelargonium sp. (Geraniaceae), Populus deltoids (Salicaceae) and Stachys byzantine (Lamiaceae).